CN205990921U - Double-deck lining cutting special defects circular cross section Tunneling by mining method structure - Google Patents
Double-deck lining cutting special defects circular cross section Tunneling by mining method structure Download PDFInfo
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- CN205990921U CN205990921U CN201620781494.6U CN201620781494U CN205990921U CN 205990921 U CN205990921 U CN 205990921U CN 201620781494 U CN201620781494 U CN 201620781494U CN 205990921 U CN205990921 U CN 205990921U
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Abstract
The utility model discloses a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure, purpose is, double-deck lining structure pattern by similar round section and secondary lining, three lining cutting, and secondary lining reach intensity requirement after remove the procedure calls of internal interim type steel support again, deform controlled and safety of surrounding environment during ensure that constructing tunnel, achieve the Tunneling by mining method structural shape under particular/special requirement, the technical scheme being adopted is：Conventional tunnel cross-section pattern is optimized for similar round section, conventional liner structure is divided into the composite structure of+three lining cutting of secondary lining simultaneously, and after secondary lining reach remove internal interim type steel support after design strength again profiled outline line style be smoother so that double-deck lining cutting special defects circular cross section Tunneling by mining method structure has, reasonable stress, section flexible arrangement and inner space adjustment amplitude is big, the reliable advantage of supporting structure system stress.
Description
Technical field
This utility model belong to tunnel construction technical field and in particular to a kind of bilayer lining cutting special defects circular cross section
Tunneling by mining method structure.
Background technology
For the railway traffic engineering of current cities in China, with the continuous encryption of subway gauze, follow-up subway line
When road is built, affected by built subway line and surrounding enviroment, in line alignment and paving mode, spatial relationship and structural type
Formula and construction method are stricter with the requirement of the aspects such as engineering measure.The conventional shape of a hoof or stalk arch Mining Method tunnel
Road structural shape may be limited by periphery existing buildings do not have required perform space, and conventional Tunneling by mining method lining cutting performs
Front interim type steel support is removed, stress system is changed the sedimentation causing and cannot be effectively controlled with deformation, and similar round mine
Method tunnel cross-section structure has the characteristics that outline excavation is relatively small, and construction method has flexible and changeable, strong adaptability, safety can
By the features such as, after the special double linings pattern of+three lining cutting of secondary lining and secondary lining reach intensity requirement
Remove the procedure calls of internal interim type steel support again it is ensured that the monolithic stability of tunnel structure and safety of surrounding environment.
Utility model content
In order to solve the problems of the prior art, the utility model proposes a kind of bilayer lining cutting special defects circular cross section mine
Method tunnel structure, by similar round section and secondary lining, three lining cutting double-deck lining structure it is ensured that constructing tunnel process
Middle deformation controlled with safety of surrounding environment it is achieved that Tunneling by mining method structural shape under particular/special requirement.
In order to realize object above, the technical scheme that this utility model is adopted is：Including along tunnel radial direction by outer
Preliminary bracing, secondary lining and three lining cutting inwardly setting gradually, described preliminary bracing, secondary lining and three lining cutting are constituted
The section of tunnel structure include upper and lower two sections of circular arcs, connected by straightway transition between two sections of circular arcs, described preliminary bracing
Including the grid steel frame being arranged circumferentially and gunite concrete, described secondary lining is poured using water-proof concrete with three lining cutting,
It is equipped with tunneling boring waterproof material between secondary lining and three lining cutting.
Described grid steel frame includes reinforcing bar cage bar and waling, and reinforcing bar cage bar and waling interfix in lattice
Palisade.
Described every ring grid steel frame includes four curved reinforcing bar cage bars, is fixed with the shape of a spiral between four reinforcing bar cage bars
Some walings of distribution.
The inside of described secondary lining is provided with type steel support, and type steel support is fixedly connected with grid steel frame.
Described type steel support includes two sections of arc I-steel, and one section of I-steel is fixing even with preliminary bracing vault and arch bottom
Connect, another section of I-steel is fixedly connected with preliminary bracing haunch.
Described two sections of I-steel are fixedly connected with the reinforcing bar cage bar of relevant position, mainly pass through two blocks of steel plates with holes and bolt
Realize.
The overall structure that described preliminary bracing, secondary lining and three lining cutting are constituted, its profiled outline is by upper and lower two sections of songs
The different circular arc of rate radius is constituted.
Described reinforcing bar cage bar adopts three-level Ribbed Bar with waling.
On described grid steel frame, the concrete of injection is C25 concrete.
Described type steel support adopts the 22a type I-steel that material is Q235.
Described secondary lining and three lining cutting adopt C35 water-proof concrete, and described tunneling boring waterproof material adopts EVA plastics
Splash guard.
Compared with prior art, structure of the present utility model has special similar round cross-sectional configuration pattern, and proposes
A kind of New Mine method tunnel structure of bilayer lining cutting, enriches existing tunnel method for designing and construction technology, has widened tunnel
Mentality of designing.By conventional tunnel cross-section pattern is optimized for similar round section, conventional liner structure is divided into two simultaneously
Secondary+three lining cutting of lining cutting so that double-deck lining cutting special defects circular cross section Tunneling by mining method structure have profiled outline line style smoother,
Reasonable stress, section flexible arrangement and inner space adjustment amplitude is big, the reliable advantage of supporting structure system stress, are not only able to
Avoid the conventional shape of a hoof or stalk arch Tunneling by mining method outline excavation is relatively large but the relatively poor shortcoming of stress performance, and
And before conventional Tunneling by mining method lining cutting can be overcome to pour, internal temporary support is removed, stress system changes the vault causing and sinks
Fall or deformation, make tunnel from excavating in the whole process finally completing, and are in all the time under reliable support system effect, from root
In basis, perfect tunnel stress system is changed the mechanism, and has significant promotion to maintaining tunnel homeostasis and safety of surrounding environment
Effect, under the more prominent background of environmental benefit, there is higher economic benefit and social benefit, urban track traffic,
Have wide practical use in the engineerings such as railway, highway.
Further, grid steel frame is constituted using the reinforcing bar cage bar and spiral some walings of four arcs,
After wet shotcreting, the overall bending rigidity of grid steel frame can improve 8 times, effectively increase the bearing capacity of preliminary bracing, enter
One step improves the load-carrying properties of this utility model structure.
Further, when secondary lining pours, internal type steel support is not yet removed, after secondary lining reaches design strength
Remove type steel support again, make tunnel from excavating to the whole process finally completing, be in all the time under reliable support system effect,
Fundamentally perfect tunnel stress system is changed the mechanism, and has significantly to maintaining tunnel homeostasis and safety of surrounding environment
Impetus, can effectively ensure that tunnel-liner perform during sedimentation with deformation controlled, safety of surrounding environment is controlled.
Further, tunnel structure of the present utility model has the similar round cross-section structure pattern not waiting circle up and down, upper and lower circle
Pass through straightway transition between arc, overall symmetrical, have that profiled outline line style is smoother, reasonable stress, section flexible arrangement
And inner space adjustment amplitude is big, the reliable advantage of supporting structure system stress.
Brief description
Fig. 1 is the structural representation of this utility model tunnel structure；
Fig. 2 is the arrangement schematic diagram of type steel support；
Fig. 3 is the schematic diagram at type steel support and the link position A of grid steel frame；
Fig. 4 is the schematic diagram at type steel support and the link position A of grid steel frame along A-A direction；
Wherein, 1- preliminary bracing, 2- secondary lining, tri- lining cutting of 3-, 4- grid steel frame, 5- type steel support, 6- steel with holes
Plate, 7- reinforcing bar cage bar, 8- waling, 9- φ 24 hole, 10- straightway.
Specific embodiment
With reference to the utility model is further explained the explanation of specific embodiment and Figure of description.
Referring to Fig. 1, structure of the present utility model includes preliminary bracing 1, secondary lining 2 and setting gradually along ecto-entad
Three lining cutting 3, the tunnel structure that preliminary bracing 1, secondary lining 2 and three lining cutting 3 are constituted, its profiled outline is by upper and lower two sections
The different circular arc of radius of curvature is constituted, and passes through straightway 10 transition and connects, preliminary bracing 1 includes being arranged circumferentially between two sections of circular arcs
Grid steel frame 4 and gunite concrete, grid steel frame 4 includes reinforcing bar cage bar 7 and waling 8, reinforcing bar cage bar 7 with longitudinally plus
Strong muscle 8 interfixes in grid-like, and every ring grid steel frame 4 includes four curved reinforcing bar cage bars 7, between four reinforcing bar cage bars 7
It is fixed with some walings 8 being distributed in the shape of a spiral.Referring to Fig. 2, the inside of secondary lining 2 is provided with type steel support 5, shaped steel
5 are supported to be fixedly connected with grid steel frame 4, type steel support 5 includes two sections of arc I-steel, and one section of I-steel is encircleed with preliminary bracing 1
Top is fixedly connected with arch bottom, and another section of I-steel is fixedly connected with preliminary bracing 1 haunch.Referring to Fig. 3 and Fig. 4, two sections of I-steel
It is connected with corresponding position reinforcing bar cage bar 7 respectively, shaped steel mainly passes through two blocks of steel plates 6 with holes with being fixedly connected of reinforcing bar cage bar 7
Realize with bolt.Secondary lining 2 is poured using water-proof concrete with three lining cutting 3, spreads between secondary lining 2 and three lining cutting 3
It is provided with tunneling boring waterproof material.
Construction method of the present utility model, comprises the following steps：
1) reinforcing bar cage bar 7 and waling 8 are interfixed curved grid-like grid steel frame 4, tunnel excavation mistake
Grid steel frame 4 is set up in time, reinforcing bar cage bar 7 adopts three-level Ribbed Bar with waling 8 in journey；
2) penetrate C25 concrete grid steel frame 4 surface is wet in time, form preliminary bracing 1；
3) set up internal interim type steel support 5, type steel support 5 adopts the 22a type I-steel that material is Q235, type steel support
5 are fixedly connected with grid steel frame 4 relevant position, realize integrated support system；
4) inside supporting in the early stage 1, C35 water-proof concrete is poured using little template and form secondary lining 2；
5) remove type steel support 5 after secondary lining 2 reaches design strength, lay tunneling boring waterproof material, and according to elder generation
Behind arch bottom, the order of vault pours C35 water-proof concrete, and the section of arch bottom and vault all pours in arc-shaped, and encircles bottom and vault
Circular arc excessively connected by straightway, form three lining cutting 3, that is, form double-deck lining cutting similar round special cross section Tunneling by mining method
Structure.
Tunnel structure of the present utility model, have up and down not wait circular arc similar round cross-section structure pattern, upper and lower circular arc it
Between pass through straightway transition, overall symmetrical, concrete radius of curvature size be embodied as scope, need to according to structure function with
Inner space use requirement determines, simultaneously special double-deck lining structure pattern, secondary lining are removed after reaching design strength again
The procedure calls of internal type steel support, can effectively ensure that tunnel-liner performs the monolithic stability of the stress system of period, peripheral edge ring
Border is safely controllable.
Secondary lining 2 is all poured using C35 water-proof concrete with three lining cutting 3, between secondary lining 2 and three lining cutting 3
Tunneling boring lays waterproof material, is provided with interim type steel support 5, the initial stage that is provided with outside secondary lining 2 props up inside secondary lining 2 simultaneously
Shield 1, does not do waterproof requirement between preliminary bracing and secondary lining.Preliminary bracing is mainly pressed with waling 8 by reinforcing bar cage bar 7 will
Welding, colligation is asked to become grid steel frame 4, subsequently gunite concrete is formed on request again, the connection of type steel support 5 and grid steel frame 4,
Mainly realized by two blocks of steel plates 6 with holes, steel plate 6 bore size with holes is φ 24 hole 9.Grid steel frame 4 adopts grade III steel, type
, all using Q235 steel, gunite concrete 8 adopts C25 early strength concrete, and waterproof material adopts EVA for bracing members 5 and steel plate 6 with holes
Drainage systems.Grid steel frame 4 and type steel support 5 longitudinal pitch typically can use 0.5m, and longitudinally excavation step pitch is identical with tunnel.
This utility model tunnel structure is mainly by upper and lower radius unequal circular arc construction and double-deck lining structure pattern, full
Structure function under sufficient specific environment and inner space use requirement, construction specifically include following steps：
Step one：According to Tunneling by mining method construction requirement, arrange that a number of dewatering well is seen with water level in tunnel both sides
Examine hole, the spacing of dewatering well press along tunnel longitudinal direction 15m about consider, can be made the appropriate adjustments according to stratum permeability, tunnel both sides
It is respectively arranged a row, carry out dewatering construction it is ensured that level of ground water about 1m below tunnel structure base plate, need in precipitation strictly to control
Sand production rate, controls the Stratum Loss that precipitation causes；
Step 2：Control to control with surrounding enviroment according to structure sedimentation and require, carry out the stratum pre-add before tunnel excavation
Gu processing；
Step 3：According to design requirement, by reinforcing bar cage bar 7 with waling 8 by certain radian requirement bending machining, then
Grid steel frame 4 is formed by welding, colligation, based on grade III steel, local colligation adopts two grades of steel, and reinforcement welding adopts E50 system
Row welding rod；
Step 4：Carry out tunnel excavation by engineering method requirement, and set up grid steel frame 4 in time, formed just after gunite concrete
Phase supporting 1, preliminary bracing 1 should be as far as possible closely connected with country rock, and grid steel frame 4 joint need to firmly weld, and gunite concrete needs on request
Carry out wet shot；
Step 5：After supporting in the early stage 1 is formed, on request in tunnel vault, arch bottom and haunch relevant position reinforcing bar cage bar 7
Upper welding steel plate 6 with holes, and two blocks of steel plates 6 with holes are connected into by an entirety by bolt；
Step 6：By tunnel cross-section pattern and excavation technology, by regulation radian requirement processing type steel support 5, type steel support 5
Radian with tunnel cross-section pattern match, and type steel support 5 need to be set up in time according to excavation progress, between type steel support 5 and steel plate 6
Reliable welding need to be carried out, using E43 series welding rod；
Step 7：On the premise of not removing type steel support 5, the little template of supporting in the early stage 1 inner utilization carries out secondary lining
Build 2 pour, using C35 water-proof concrete, little template need to be adjusted according to the position of tunnel internal type steel support 5, in type
Bracing members 5 and preliminary bracing 1 connecting portion reserving hole；
Step 8：After secondary lining 2 reaches prescribed strength, tunneling boring cuts off type steel support 5, and will be secondary with cement mortar
The floating process in lining cutting 2 surface, subsequent tunneling boring lays waterproof material, three lining cutting in tunnel is divided into upper and lower two parts and pours, press
According to the principle first encircleing vault behind bottom, first pour arch bottom and divide, after-pouring vault part, adopt straightway 10 mistake between lower circle and upper circle
Cross it is ensured that body structure surface smooth-going, form three lining cutting 3, complete double-deck lining cutting similar round special cross section Tunneling by mining method structure
Construction.
In construction：
, all using grade III steel, diameter 25mm, i.e. φ 25, every ring grid steel frame 4 comprises 4 for reinforcing bar cage bar 7 and waling 8
Root reinforcing bar cage bar 7 and 25 walings 8.Wet shot C25 concrete after grid steel frame 4 erection, the preliminary bracing 1 of formation should be really
Protect closely connected with tunnel surrounding.
Type steel support 5 adopts Q235 steel, model：Work 22a, steel plate 6 with holes is also adopted by Q235 steel, size：250mm×
250mm × 10mm, grid steel frame 5 passes through two blocks of steel plates 6 with holes with type steel support 6 and realizes being connected, and passes through to penetrate between steel plate 6 with holes
The diameter 22mm bolt of φ 24 in the hole is attached, and steel plate 6 size with holes and bore size etc. can be entered according to concrete load
Row adjustment.
Secondary lining 2 adopts C35 water-proof concrete, period do not remove the internal interim type steel support 5 of preliminary bracing 1 it is impossible to
Set up formwork jumbo, therefore need to be constructed using little template, little template need to be opened with grid steel frame 4 junction in type steel support 5
Hole, concrete position of opening and bore size can according to grid steel frame 4 model, erection situation is corresponding adjusts.
Three lining cutting 3 adopt C35 water-proof concrete, remove the interim type steel support 5 within secondary lining 2 before construction, with
When need to carry out after secondary lining 2 reaches the 80% of design strength, secondary lining 2 remove after need using the floating place of cement mortar
Reason, subsequent tunneling boring lays waterproof material, according to principle casting concrete from the bottom up.
Theoretically to find out the tunnel structure adapting to the requirement of arbitrary cross-section pattern, structure safety and periphery can be met
Environment is controlled, also can meet inside configuration space use requirement, but also need to meet the Mining Method tunnel of conventional construction technological requirement
Road structural shape and its construction method, under the conditions of existing theoretical level with construction technology, still have sizable difficulty, because
Tunneling by mining method structure outline must try one's best smoother reduce structure sediment and deformation to meet force request as far as possible, but circular disconnected
Face has obvious inferior position meeting tunnel internal all kinds of gauge requesting party face, and Tunneling by mining method internally tear open by temporary support simultaneously
Except when, will necessarily cause the transformation of stress system and the reassignment of stress, and then the impact of the disturbance to surrounding formations and environment
It is inevitable to a certain extent.And Tunnel Engineering protection requires in addition to oneself factor in addition it is also necessary to consider periphery
The different requirements of environment, are especially closing on existing subway station and tunnel, underground commerce synthesises and hospital, school and reality
Test in the case that room etc. lays special stress on protecting object, current Tunneling by mining method structure design and construction, still need to according to " pipe is advanced, tight
The basic principle of slip casting, short excavation, strong supporting, early closing, diligent measurement " ten Eight Terms Guidelines is carried out.
This utility model " double-deck lining cutting special defects circular cross section Tunneling by mining method structure " refers mainly to up-small and down-big similar round
Tunnel cross-section pattern, and double-deck lining structure pattern, have that section flexible arrangement, inner space adjustment amplitude be big, supporting knot
Structure system stress feature that is reliable and changing flexibly and adapt to all kinds of environmental requirements.Both the conventional shape of a hoof or stalk had been avoided
Arch Tunneling by mining method outline excavation is relatively large but shortcoming that stress performance is relatively poor, under the conditions of solving common process again
Type steel support teardown phase, sedimentation and deformation that flexible grid steel frame is caused with preliminary bracing stress redistribution.Can realize working as
In the case of city underground gauze begins to take shape, urban rail corridor already taken up main space below major urban arterial highway, ground
Lower engineering remains to the purpose implemented using double-deck lining cutting special defects this conventional means of circular cross section Tunneling by mining method, has higher
Economic benefit and social benefit, have wide practical use in the engineerings such as urban track traffic, railway, highway.
This utility model passes through the not equivalent section type up and down of double-deck lining cutting special defects circular cross section Tunneling by mining method structure
Formula, the special lining structure pattern of+three lining cutting of secondary lining, and the carrying effect in advance of secondary lining, not only can meet
Tunnel contour is smoother and force request, and interim type steel support in tunnel can be avoided to remove and the stress system transition period
Stress Release and its sedimentation and deformation it is achieved that the improvement of tunnel cross-section form and stress system.
Content of the present utility model is not limited to cited by embodiment, and those of ordinary skill in the art pass through to read this practicality newly
Type description and any equivalent conversion that technical solutions of the utility model are taken, are claim institute of the present utility model
Cover.
Claims (10)
1. a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure is it is characterised in that include along tunnel radial direction
Preliminary bracing (1), secondary lining (2) and three lining cutting (3) that ecto-entad sets gradually, described preliminary bracing (1), secondary lining
Build (2) and the section of tunnel structure that three lining cutting (3) are constituted includes upper and lower two sections of circular arcs, by straight line between two sections of circular arcs
Section transition connects, and described preliminary bracing (1) includes circumferentially disposed grid steel frame (4) and gunite concrete, described secondary lining
(2) poured using water-proof concrete with three lining cutting (3), be equipped with tunneling boring between secondary lining (2) and three lining cutting (3) and prevent
Water material.
2. according to claim 1 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described grid steel frame (4) includes reinforcing bar cage bar (7) and waling (8), and reinforcing bar cage bar (7) is with waling (8) mutually
Fixing is in grid-like.
3. according to claim 2 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described every ring grid steel frame (4) includes four curved reinforcing bar cage bars (7), is fixed with helically between four reinforcing bar cage bars (7)
Some walings (8) of shape distribution.
4. according to claim 3 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
The inside of described secondary lining (2) is provided with type steel support (5), is welded and fixed between type steel support (5) and grid steel frame (4).
5. according to claim 4 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described type steel support (5) includes two sections of arc I-steel, and one section of I-steel is fixing even with the vault of preliminary bracing (1) and arch bottom
Connect, another section of I-steel is fixedly connected with preliminary bracing (1) haunch.
6. according to claim 5 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described two sections of I-steel are fixedly connected by two pieces of steel plates (6) with holes and bolt with the reinforcing bar cage bar (7) of relevant position.
7. according to claim 6 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described reinforcing bar cage bar (7) adopts three-level Ribbed Bar with waling (8).
8. according to claim 7 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Described type steel support (5) adopts the 22a type I-steel that material is Q235, and tunneling boring waterproof material adopts EVA plastic plate.
9. according to claim 1 a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure it is characterised in that
Upper and lower two sections of circles of the integrally-built profiled outline that described preliminary bracing (1), secondary lining (2) and three lining cutting (3) are constituted
Arc radius of curvature is different.
10. a kind of bilayer lining cutting special defects circular cross section Tunneling by mining method structure according to claim 1, its feature exists
In the concrete of the upper injection of described grid steel frame (4) is C25 concrete, and described secondary lining (2) is adopted with three lining cutting (3)
C35 water-proof concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620781494.6U CN205990921U (en) | 2016-07-22 | 2016-07-22 | Double-deck lining cutting special defects circular cross section Tunneling by mining method structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620781494.6U CN205990921U (en) | 2016-07-22 | 2016-07-22 | Double-deck lining cutting special defects circular cross section Tunneling by mining method structure |
Publications (1)
| Publication Number | Publication Date |
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| CN205990921U true CN205990921U (en) | 2017-03-01 |
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ID=58102286
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620781494.6U Expired - Fee Related CN205990921U (en) | 2016-07-22 | 2016-07-22 | Double-deck lining cutting special defects circular cross section Tunneling by mining method structure |
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| CN (1) | CN205990921U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107945646A (en) * | 2017-11-10 | 2018-04-20 | 北京工业大学 | A kind of assembled tunnel model structure and preparation method thereof |
| CN108843346A (en) * | 2018-07-18 | 2018-11-20 | 中铁十二局集团第二工程有限公司 | Lining construction method of the large section shallow-depth-excavation tunnel in water-rich sand layer |
| CN108894801A (en) * | 2018-07-04 | 2018-11-27 | 中铁十局集团第五工程有限公司 | The impervious structure of high-pressure water-rich solution cavity of tunnel section supporting and construction method |
-
2016
- 2016-07-22 CN CN201620781494.6U patent/CN205990921U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107945646A (en) * | 2017-11-10 | 2018-04-20 | 北京工业大学 | A kind of assembled tunnel model structure and preparation method thereof |
| CN108894801A (en) * | 2018-07-04 | 2018-11-27 | 中铁十局集团第五工程有限公司 | The impervious structure of high-pressure water-rich solution cavity of tunnel section supporting and construction method |
| CN108843346A (en) * | 2018-07-18 | 2018-11-20 | 中铁十二局集团第二工程有限公司 | Lining construction method of the large section shallow-depth-excavation tunnel in water-rich sand layer |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170301 Termination date: 20170722 |